N.D. Cent. Code § 35-18-05
The filing of a hospital statement, from the time of filing thereof, is constructive notice to all persons of the claim of the hospital and of its right to a lien upon any claim or demand or claim for relief against the tort-feasors and the insurer or insurers of the tort-feasors, or an insurer of the injured person, and no release of any judgment, claim, or demand by the injured person is valid or effective as against the lien. The person, corporation, or limited liability company making any payment to the injured person, or to the injured person's legal representative, as compensation for injuries sustained, in settlement of a claim for relief claimed to exist for negligence causing such injuries, or out of insurance carried by the tort-feasor, shall remain liable to the hospital for the amount of the reasonable charges due at the time of such payment to the extent of the full amount so paid or given to the injured person.
N.D.C.C. § 35-18-05